Chemistry - Unit 1

Length

meter (m)

Time

seconds (s)

Mass

kilogram (kg)

Temperature

kelvin (k)

Precision

Consistent Measurements (preferred one)

Accuracy

Closeness to actual value

Electric Current

ampere (A)

Amount of a substance

mole (mol)

Mnemonic device for unit conversions

King Henry Died Drinking Chocolate Milk

Tera

1 × 10^-12Tm = 1m

Giga

1 × 10^-9Gm = 1m

Mega

1 × 10^-6Mm = 1m

Kilo

1 × 10^-3km = 1m

Hecto

1 × 10^-2hm = 1m

Deca

1 × 10^-1dam = 1m

Deci

1 × 10¹dm = 1m

Centi

1 × 10²cm = 1m

Milli

1 × 10³mm = 1m

Micro

1 × 10⁶µm = 1m

Nano

1 × 10⁹nm = 1m

Pico

1 × 10¹²pm = 1m

Converting C to K

K = C + 273.5

Converting K to C

C = K - 273.5

Converting F to C

C = 5/9 ( F - 32)

Converting C to F

F = 9/5 (C ) + 32

Scientific Method

Way to gain knowledge through observations

Experiment

Observation of natural phenomena tested in a controlled and repeatable process, which results in a rational conclusion

Hypothesis

Tentative and testable explanation for an observation

Theory

Tested explanation of a basic natural phenomena

Law

Statement that summarizes a vast number of experimental observations, and describes/predicts some aspect of the world

Multiplying/Dividing Sig Figs

Answer based on least # of sig figs in calculation

Addition/Subtraction Sig Figs

number of sig figs depends on number with least amount of decimal points

Zeros in Sig Figs

Only significant if captured or after a decimal point

Exact Numbers Sig Figs

Exact numbers have an infinite number of sig figs